Since a large cooler integrated system, delivery, exhaust smoke machine at the same shoulder of tunnel ventilation, so when switching between different usage conditions, it will have some technical problems. The first is to send, resistance exhaust system is inconsistent, when the control system requires two fans operating in parallel to the interval when Beijing carried out supply or exhaust cooler effect, will result in larger parallel efficiency loss; secondly cooler production, At the end of air-conditioning season, the station into the ventilation mode of operation, a large cooler increases the resistance of the air supply system. Cooler is divided into two categories: 1. serpentine coil type 2. Maintenance of cold type 4 fan coil usually installed directly in the air-conditioned rooms, their work status and quality of work will affect indoor air quality and noise levels . We must do the air filter, drip tray, coils, fans and other major components of the routine maintenance work to ensure that the fan coil functioning properly, do not produce negative effects. ANALYTICAL cooler, Vanke air conditioning professional production (certified), coolers provided by the Texas Air Conditioning Equipment Co., Ltd. Vanke. Vanke Texas Air Conditioning Equipment Co. (www.dzwkkt.com) (www.dzwkkt.com) Shandong Dezhou, central air conditioning leader, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer demand. Vanke air conditioning leadership with the staff warmly welcome all inquiries negotiations to create a better future for China Vanke air conditioning.